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Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2017
Other Comprehensive Income (Loss) [Abstract] |
Other Comprehensive Income (Loss) | Other Comprehensive Income (Loss) Other comprehensive income (loss) components, net of income tax, are shown in the following table for the years ended December 31, 2017, 2016 and 2015.
Year ended December 31, (in thousands) |  | Changes in Pension Plan assets and benefit obligations |  | Unrealized gains and losses on available-for-sale securities |  | Total
Beginning balance at January 1, 2017 |  | $ | (14,740 | ) |  | $ | (3,005 | ) |  | $ | (17,745 | )
| Other comprehensive (loss) gain before reclassifications |  | (9,241 | ) |  | 1,261 |  |  | (7,980 | )
| Amounts reclassified from accumulated other comprehensive loss |  | 455 |  |  | (1,184 | ) |  | (729 | )
Net current period other comprehensive (loss) income |  | (8,786 | ) |  | 77 |  |  | (8,709 | )
Ending balance at December 31, 2017 |  | $ | (23,526 | ) |  | $ | (2,928 | ) |  | $ | (26,454 | )
Beginning balance at January 1, 2016 |  | $ | (15,351 | ) |  | $ | (292 | ) |  | $ | (15,643 | )
| Other comprehensive gain (loss) before reclassifications |  | 109 |  |  | (2,713 | ) |  | (2,604 | )
| Amounts reclassified from accumulated other comprehensive loss |  | 502 |  |  | — |  |  | 502 |
Net current period other comprehensive income (loss) |  | 611 |  |  | (2,713 | ) |  | (2,102 | )
Ending balance at December 31, 2016 |  | $ | (14,740 | ) |  | $ | (3,005 | ) |  | $ | (17,745 | )
Beginning balance at January 1, 2015 |  | $ | (14,865 | ) |  | $ | 1,257 |  |  | $ | (13,608 | )
| Other comprehensive loss before reclassifications |  | (910 | ) |  | (1,549 | ) |  | (2,459 | )
| Amounts reclassified from accumulated other comprehensive loss |  | 424 |  |  | — |  |  | 424 |
Net current period other comprehensive loss |  | (486 | ) |  | (1,549 | ) |  | (2,035 | )
Ending balance at December 31, 2015 |  | $ | (15,351 | ) |  | $ | (292 | ) |  | $ | (15,643 | )
The following table provides information concerning amounts reclassified out of accumulated other comprehensive loss for the years ended December 31, 2017, 2016 and 2015:
|  | Amount Reclassified from Accumulated Other Comprehensive Loss |  | Affected Line Item in the Consolidated Statement of Income
(In thousands) |  | 2017 | 2016 | 2015 |  |
Amortization of defined benefit pension items |  |  |  |  |  |
| Amortization of prior service cost |  | $ | — |  | $ | — |  | $ | 15 |  |  | Employee benefits
| Amortization of net loss |  | 576 |  | 773 |  | 637 |  |  | Employee benefits
Income before income taxes |  | 576 |  | 773 |  | 652 |  |  | Income before income taxes
| Federal income taxes |  | 121 |  | 271 |  | 228 |  |  | Federal income taxes
| Net of income tax |  | $ | 455 |  | $ | 502 |  | $ | 424 |  |  | Net of income tax
Unrealized gains & losses on available for sale securities |  |  |  |  |  |
| Gain on sale of investment securities |  | $ | (1,821 | ) | $ | — |  | $ | — |  |  | Gain on sale of investment securities
| Other than temporary impairment |  | — |  | — |  | — |  |  | Miscellaneous expense
Income before income taxes |  | (1,821 | ) | — |  | — |  |  | Income before income taxes
| Federal income taxes |  | (637 | ) | — |  | — |  |  | Federal income taxes
| Net of income tax |  | $ | (1,184 | ) | $ | — |  | $ | — |  |  | Net of income tax

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- Definition Other Comprehensive Income (Loss) + References No definition available. + Details
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Namespace Prefix: | prk_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
Name: | us-gaap_ComprehensiveIncomeNoteTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration